Silverstripe 4 Alpha 5 Fatal Error on Install

If you receive a fatal error, refresh this page to continue the installation
Setting up 'mysite/_config.php'...
Setting up /var/www/SS_CMS/mysite/_config.php
Setting up 'mysite/_config/config.yml'
Setting up /var/www/SS_CMS/mysite/_config/config.yml
Setting up '.htaccess' file...
Setting up /var/www/SS_CMS/.htaccess
Building database schema...
Fatal error: Interface 'PHPUnit_Framework_TestListener' not found in /var/www/SS_CMS/framework/src/Dev/SapphireTestReporter.php on line 46

Refreshing the page does not continue the installation. I'm hoping somebody can point me in the right direction.

How did you install SilverStripe? Via composer or the ZIP/TAR download?

I get:Fatal error: Call to undefined method SilverStripe\Config\Collections\CachedConfigCollection::setPool() in XXX/framework/src/Core/Config/CoreConfigFactory.php on line 51
with a Composer install of alpha 5.

And:Fatal error: Interface 'PHPUnit_Framework_TestListener' not found in /XXX/framework/src/Dev/SapphireTestReporter.php on line 46
when installing from the TAR.